JP2004105112A - Sulky type lawnmower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a power from an engine to a traveling transmission structure to be transmitted without blocking an operator from getting on and off a traveling machine body by a simple structure when arranging an engine 4, a steering wheel 5 and an operator's seat 6 in the traveling machine body 1 in order from the front side, arranging a discharging duct 23 of mowed grass from a rotary mower 14 arranged between front wheels 2 and rear wheels so as to extend between both of the rear wheels 3 in the rear direction, and arranging the traveling transmission structure 24 at the upper side of the discharging duct 23. <P>SOLUTION: The lawnmower is constituted by arranging a middle shaft 26 at a site neighboring to the front side of the traveling transmission structure 24 in the longitudinal direction. The power is transmitted through a power transmission shaft 32 nearly horizontally extending rearward from the output shaft 4b of the engine to the lower end of the middle shaft, and the power is transmitted from the upper end of the middle shaft 26 to the input shaft 24a of the traveling transmission structure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a riding lawn mower in which a rotary mower that is rotatably driven by an engine mounted on the traveling body is mounted on a traveling body on which an operator rides and operates.
[0002]
[Prior art]
Conventionally, in this type of riding lawn mower, a pair of left and right front wheels, and an upper surface of a traveling body supported by a pair of left and right rear wheels, an engine, a steering handle for steering the front wheels, and A pilot seat is mounted in order from the front, and the power of the engine is transmitted to the two rear wheels, so that the traveling body travels forward, and both the front wheels and the two rear wheels of the traveling body are configured. A rotary mower is mounted in a portion between the rotary mower and the rotary mower, and is configured to be rotationally driven by power transmission from the engine (for example, see Patent Document 1).
[0003]
However, this conventional riding lawn mower is configured so that the lawn mower mowed by the rotary mower is sucked by a fan provided at one end of the rotary mower, so that the lateral width of the mower is equal to that of the fan. It increased by the amount, which led to an increase in size.
[0004]
Therefore, in a recent riding lawn mower, the discharge duct of the cut grass cut with the rotary mower mounted between the front wheels and the rear wheels extends rearward to a portion between the left and right rear wheels. It is configured to be arranged as follows.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-9557
[Problems to be solved by the invention]
However, arranging the lawn discharge duct from the rotary mower so as to extend rearward at a portion between the left and right rear wheels as described above requires the traveling mission mechanism for both rear wheels to be mounted on the lawn discharge duct. The traveling transmission mechanism must be located at a high position in order to secure a predetermined height dimension in the cut grass discharge duct, and in this connection, The power transmission mechanism from the engine mounted on the front part of the traveling aircraft to the traveling mission mechanism is the same as the traveling mission mechanism is located at a higher position as described above, and the steering handle and the steering seat of the traveling aircraft are There is a problem in that the projecting member protrudes from the floor surface in a portion where the operator gets on and off the vehicle, so that the operator gets in and out of the traveling body.
[0007]
In order to prevent the power transmission mechanism of the traveling transmission mechanism from protruding from the engine from the engine, the power transmission mechanism must be configured to be detoured so as to avoid the cut grass discharge duct. The structure of the transmission mechanism becomes complicated, resulting in an increase in size and an increase in weight.
[0008]
An object of the present invention is to solve this problem by a simple configuration of a power transmission mechanism.
[0009]
[Means for Solving the Problems]
In order to achieve this technical object, claim 1 of the present invention provides
`` On a traveling body supported by both front wheels and both rear wheels, an engine, a steering handle for steering the front wheels, and a control seat on which an operator rides are arranged in order from the front, while the A rotary mower is attached to a portion between the front wheels and the rear wheels, and a lawn discharge duct from the rotary mower is disposed so as to extend rearward between the rear wheels. In a riding lawn mower comprising a traveling transmission mechanism for the rear wheels on the upper surface of a duct,
An intermediate shaft is disposed vertically at a position adjacent to the front side of the traveling transmission mechanism, and power is transmitted to a lower end of the intermediate shaft via a power transmission shaft extending substantially horizontally rearward from an output shaft of the engine. Meanwhile, power is transmitted from the upper end of the intermediate shaft to the input shaft of the traveling transmission mechanism. "
It is characterized by:
[0010]
Claim 2 of the present invention
"In the description of the above-mentioned claim 1, the intermediate shaft is disposed at a position shifted laterally from the output shaft of the engine in plan view, and the intermediate shaft is connected to the output shaft of the engine. The power transmission shaft is inclined obliquely outward toward the rear in plan view. "
It is characterized by:
[0011]
Furthermore, claim 3 of the present invention
"In the above-mentioned claim 1 or 2, the blow impeller that generates a downward airflow is rotated on the upper surface of the traveling transmission mechanism by power transmission from an input shaft or the intermediate shaft in the traveling transmission mechanism. To be provided. "
It is characterized by:
[0012]
In addition, claim 4 of the present invention provides
"In any one of claims 1 to 3, the engine may be stopped at the rear of the cockpit when an operator leaves the cockpit, or the engine may be one of the rear wheels and the rotary mower. A seat switch mechanism adapted to cut off power transmission to one or both of them will be provided. "
It is characterized by:
[0013]
[Action and Effect of the Invention]
According to the above-described configuration, it is possible to secure a predetermined height dimension in the cut grass discharge duct while transmitting the power of the engine to the traveling transmission mechanism by one power transmission shaft. The power transmission shaft can be lowered by the vertical dimension of the intermediate shaft in a state in which the traveling transmission mechanism is located at a high position as described above. It is possible to reduce the height of the power transmission shaft protruding from the floor so as not to protrude significantly from the floor at the portion where the operator gets on and off between the vehicle and the control seat.
[0014]
Therefore, according to the present invention, the power transmission mechanism from the front engine to the rear traveling transmission mechanism has a simple structure, and the operator can smoothly discharge the mowing turf backward. This makes it easy to get on and off the vehicle.
[0015]
By the way, in the riding lawn mower, the engine is mounted at a position substantially at the center in the lateral direction of the traveling body in plan view, and the operation handle is also disposed at a substantially center position in the lateral direction of the traveling body in plan view. Therefore, the handle shaft for transmitting the rotation of the steering handle to the steering gear box for both front wheels is naturally located at a substantially central portion in the width direction of the traveling body in plan view.
[0016]
For this reason, disposing the power transmission shaft to the traveling transmission mechanism so as to extend substantially horizontally rearward from the output shaft of the engine means that the power transmission shaft interferes with the handle shaft. Therefore, the steering gear box must be located at a position higher than the power transmission shaft, so that a portion near the lower part of the steering wheel on the floor of the traveling body is raised for the steering gear box. As a result, the floor surface around the feet of the worker becomes narrow.
[0017]
On the other hand, the present invention proposes a configuration according to claim 2.
[0018]
That is, the intermediate shaft is disposed at a position laterally displaced from the output shaft of the engine in plan view, and the power transmission shaft connecting the intermediate shaft and the output shaft of the engine is viewed in plan. By inclining obliquely outward toward the rear, the power transmission shaft can be prevented from interfering with the handle shaft, and the steering gear box can be disposed below the power transmission shaft. In addition, the floor surface around the feet of the worker riding the traveling body can be widened.
[0019]
In addition, by configuring as described in claim 3, the traveling transmission mechanism can be forcibly cooled, and the heat generated by the traveling transmission mechanism and the dust generated at the time of lawn mowing rise to the cockpit seat side. There is an advantage that it can be reliably reduced.
[0020]
Furthermore, by configuring as described in claim 4, the height dimension of the seat switch mechanism with respect to the pilot seat can be prevented from being added to the height position of the pilot seat from the traveling machine body. There is an advantage that the pilot seat can be located at such a low position.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0022]
In this figure, reference numeral 1 denotes a traveling body constituted by a pair of left and right side frames 1a extending in the front-rear direction, and the traveling body 1 includes a pair of left and right front wheels 2 and a pair of left and right rear wheels 3 similarly. An engine 4 is mounted on an upper surface of a front portion of the traveling body 1 which is supported, and a steering handle 5 for steering the both front wheels 2 so as to rotate simultaneously is provided. A control seat 6 on which a worker sits is provided on a rear upper surface of the traveling machine body 1. Furthermore, on the upper surface of the traveling body 1, a front cowl 7 including a fender 7a covering the upper portions of the rear wheels 3 and a step platform 7b on a front portion of the pilot seat is provided. The front cowl 7 is provided with a hood cover 8 for the engine 4 so as to be openable and closable.
[0023]
The rear wheels 3 are mounted on lower ends of brackets 9 fixed to the outer surfaces of both side frames 1a of the traveling body 1 so as to extend in the vertical direction.
[0024]
On the other hand, the front wheels 2 are rotatable in the vertical direction with a center pin 10 at a central portion of the front lower surface of the traveling body 1 on a center line 1b in the width direction of the traveling body 1 in plan view. A steering gear box 12 pivotally pivoted in the horizontal direction at both ends of a front axle 11 pivotally pivoted to the front axle 11 and simultaneously pivoting and pivoting the two front wheels 2 in the same direction. The steering handle 5 is attached to an upper end of a handle shaft 13 that is provided at a position above the steering gear box 12 and is provided upright from the steering gear box 12.
[0025]
A rotary mower 14 having a pair of left and right rotary mowing blades 14 a is provided on the lower surface side of the traveling body 1 and between the front wheels 2 and the rear wheels 3. And the rear link 16 so as to be movable up and down, and is configured to move up and down by the rotation of a lift lever 17 disposed on the right side of the control seat 6.
[0026]
One output shaft 4a of the engine 4 projects forward from the engine 4 and the other output shaft 4b projects backward from the engine 4, and the rotation of the one output shaft 4a projecting forward is controlled by the traveling body 1 Power is transmitted by a belt 19 to an intermediate shaft 18 that is supported at the front of the center pin 10 so as to extend in the front-rear direction above the center pin 10, and the rotation of the intermediate shaft 18 is provided on the rotary mower 14. Power is transmitted to the motor 20 via a telescopic power transmission shaft 21 having universal joints 21a and 21b at both ends, and between the vertical axis 20 and the support shaft 14b of the both-rotational cutting blade 14a. By winding the endless belt 22, the both cutting blades 14a are configured to rotate in mutually opposite directions as indicated by the dotted arrows in FIG.
[0027]
Also, on the rear lower surface side of the traveling machine body 1, there is a cut grass discharge duct 23 for discharging the cut grass cut by the both cutting blades 14a backward, between the two rear wheels 3, more precisely, the rear wheel 3 is provided. It is provided so as to extend rearward between a pair of right and left brackets 9 to be attached.
[0028]
In this case, the rear part of both side frames 1a in the traveling body 1 is inclined obliquely upward by an appropriate angle θ with respect to the horizontal toward the rear, and the cutting surface is provided on the lower surface of the obliquely upwardly inclined part. The ceiling plate 23a is configured to be inclined obliquely upward toward the rear by being arranged along the upper surface of the ceiling plate 23a of the turf discharge duct 23.
[0029]
A traveling transmission mechanism 24 for transmitting the rotation of the engine 4 to the rear wheels 3 by appropriately shifting the rotation of the engine 4 is provided above the cut grass discharge duct 23 and below the control seat 6. A vertical input shaft 24a for the traveling transmission mechanism 24 is disposed so as to protrude upward, and the two rear wheels 3 are output from an output shaft 24b that projects laterally outward from both left and right sides of the traveling transmission mechanism 24. The endless chain 25 is configured to transmit power.
[0030]
A longitudinally extending intermediate shaft 26 is rotatably supported by a gear case 27 attached to the traveling machine body 1 at a position forward of the traveling transmission mechanism 24 and adjacent to the traveling transmission mechanism 24, An endless belt 30 is wound around a pulley 28 fitted on the upper end of the intermediate shaft 26 and a pulley 29 fitted on the input shaft 24a of the traveling transmission mechanism 24, while supporting the intermediate shaft 26. At the lower end of the gear case 27, a horizontal shaft 31 interlocking with the intermediate shaft 26 via a bevel gear is provided so as to protrude forward, and this horizontal shaft 31 and the other rearward output shaft 4b of the engine 4 are connected to each other. Are connected via a telescopic power transmission shaft 32 having universal shaft joints 32a and 32b at both ends, so that the power from the engine 4 is supplied to the telescopic power transmission shaft 32 and the horizontal shaft 3 , Configured to transmit the driving transmission mechanism 24 via the intermediate shaft 26 and the endless belt 30.
[0031]
In this case, the gear case 27 which supports the intermediate shaft 26 is disposed at a position which is appropriately shifted laterally from the center line 1b of the traveling body 1 by a dimension L in a plan view of FIG. By inclining the telescopic power transmission shaft 32 obliquely outward toward the rear in plan view, the telescopic power transmission shaft 32 and the handle shaft 13 intersect each other, and the steering gear box 12 Are arranged below the telescopic power transmission shaft 32.
[0032]
A blower impeller 46 is provided at an upper end of the input shaft 24a of the traveling transmission mechanism 24 so as to suck air around the control seat 6 to generate a downward airflow.
[0033]
In this case, by forming the pulley 28 at the upper end of the intermediate shaft 26 as a blower impeller, the downward airflow by the blower impeller 46 can be configured to be accelerated.
[0034]
A rail 33 extending in the front-rear direction is provided above the both brackets 9 to which the rear wheels 3 are attached. The rail 33 supports a seat support bracket 34 movably in the front-rear direction. The front end of the control seat 6 is pivotally connected to the front end of the seat support bracket 34 by a pin 35 so as to be rotatable, so that the control seat 6 can be moved and adjusted in the front-rear direction. Configure freely.
[0035]
A lever rod 37 provided with a roller 36 at the front end of the seat support bracket 34 behind the pilot seat 6, the roller 36 being in contact with the lower surface of the rear part of the pilot seat 6. And the lever 37 is urged by a torsion spring 39 wound around a pivot pin 38 so as to rotate in a direction to lift the rear part of the control seat 6, The seat support bracket 34 is provided with a switch 40 that is turned on and off by the rotation of the lever rod 37, so that when an operator sits on the control seat 6, the cushion body 41 at the rear of the control seat 6 is provided. Moves downward until it comes into contact with the seat support bracket 34 against the torsion spring 39, and the switch 40 is turned ON or OFF to start the engine 4 or to move the engine 4 When the power transmission to the wheel 3 and the rotary mower 14 is turned on, and the operator separates from the control seat 6, the rear portion of the control seat 6 is lifted up from the seat support bracket 34 by the torsion spring 39, and When the switch 40 is turned off or on, the operation of the engine 4 is stopped, or the power transmission from the engine 4 to the rear wheel 3 and the rotary mower 14 is turned off. That is, the engine 4 is stopped when the operator separates from the control seat 6 by the lever rod 37, the torsion spring 39, the switch 40, and the like, or the two rear wheels 3 and the rotary mower 14 are removed from the engine 4. The seat switch mechanism 48 is configured to cut off power transmission to one or both of them.
[0036]
The seat switch mechanism 48 including the lever rod 37, the torsion spring 39, the switch 40, and the like is provided at a position shifted to one of the left and right sides (right side) of the control seat 6 in plan view. The fuel tank 42 mounted on the rear part of the control seat 6 of the traveling body 1 can be made larger by an amount by which the seat switch mechanism 48 is shifted to one side.
[0037]
In addition, the seat support bracket 34 is provided with an operation handle 43 adapted to fix the front-rear movement of the control seat 6 immovably at an arbitrary position.
[0038]
Further, a shift pedal 44 for the traveling transmission mechanism 24 and a brake pedal 45 are provided on the right side of the middle part of the upper surface of the traveling body 1.
[0039]
In this configuration, when the operator sits on the control seat 6 while riding on the traveling body 1, the engine 4 is activated by the seat switch mechanism 48 including the lever rod 37, the torsion spring 39, the switch 40, and the like. When the engine starts, the power transmission from the engine 4 to the rear wheel 3 and the rotary mower 14 is turned ON, and the traveling body 1 can travel forward while rotating the rotary mower 14, so that predetermined lawn mowing is performed. The lawn grass cut by this lawn mowing can be discharged backward from inside the cut grass discharge duct 23, or can be detached from a rear end portion of the cut grass discharge duct 23 in a catcher box 47. Will be released.
[0040]
As described above, the intermediate shaft 26 is disposed vertically at a position adjacent to the front side of the traveling transmission mechanism 24, and substantially at the lower end of the intermediate shaft 26 rearward from the other output shaft 4b of the engine 4. Power is transmitted via a horizontally extending power transmission shaft 32, while power is transmitted from the upper end of the intermediate shaft 26 to the input shaft 24a of the traveling transmission mechanism 24, so that the power of the engine 4 is reduced by one. While transmitting the power to the traveling transmission mechanism 24 by the power transmission shaft 32, the traveling transmission mechanism 24 is positioned at a high position so as to secure a predetermined height dimension to the cut grass discharge duct 23. Since the power transmission shaft 32 can be lowered by the vertical dimension of the intermediate shaft 26, the power transmission shaft 32 is The projecting height of the power transmission shaft 32 from the floor (the step platform 7b) should be adjusted so that the operator does not greatly protrude from the floor (the step platform 7b) at the portion where the operator gets on and off the control seat 6. It can be configured to be low.
[0041]
The power transmission shaft 32 interferes with the handle shaft 13 by arranging the intermediate shaft 26 at a position laterally displaced from the center line 1b of the traveling body 1 by an appropriate dimension L in a plan view. Since the steering gear box 12 can be disposed below the power transmission shaft 32, the floor of the traveling body 1 around the foot of an operator who rides on the steering gear box 12 can be widened.
[0042]
Furthermore, by providing the blower impeller 46 on the input shaft 24 of the traveling transmission mechanism 24, the traveling transmission mechanism 24 can be forcibly cooled, and the heat generated by the traveling transmission mechanism 24 and the heat generated at the time of lawn mowing are generated. It is possible to surely reduce the dust flying up to the cockpit 6.
[0043]
In addition, a seat switch mechanism 48 composed of the lever rod 37, the torsion spring 39, the switch 40 and the like is disposed at the rear of the control seat 6, so that the seat switch mechanism for the control seat 6 is provided. Can be prevented from being added to the height position of the control seat 6 from the traveling machine body 1, so that the control seat 6 can be located at a lower position.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is an enlarged view showing a main part of FIG. 1;
FIG. 4 is a plan view of FIG. 3;
FIG. 5 is an enlarged view showing a structure of a control seat.
FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;
7 is a sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Running body 2 Front wheel 3 Rear wheel 4 Engine 4a, 4b Engine output shaft 5 Steering handle 6 Steering seat 7 Front cowl 7b Step platform 12 Steering gear box 13 Handle shaft 14 Rotary mower 24 Transmission mission mechanism 24a Input of transmission mission mechanism Shaft 26 Intermediate shaft 32 Power transmission shaft 46 Blast impeller 48 Seat switch mechanism

Claims (4)

On a traveling body supported by both front wheels and both rear wheels, an engine, a steering handle for steering the front wheels, and a control seat on which an operator rides are arranged in order from the front, and A rotary mower is attached to a portion between the front wheel and the rear wheels, and a grass discharge duct from the rotary mower is disposed so as to extend rearward between the rear wheels. On the upper surface of the riding lawn mower comprising a traveling transmission mechanism for the two rear wheels,
An intermediate shaft is disposed vertically at a position adjacent to the front side of the traveling transmission mechanism, and power is transmitted to a lower end of the intermediate shaft via a power transmission shaft extending substantially horizontally rearward from an output shaft of the engine. On the other hand, power is transmitted from an upper end of the intermediate shaft to an input shaft of the traveling transmission mechanism. 2. The intermediate shaft according to claim 1, wherein the intermediate shaft is disposed at a position shifted laterally from an output shaft of the engine in a plan view, and connects the intermediate shaft and an output shaft of the engine. A riding lawn mower characterized in that the power transmission shaft is inclined obliquely outward toward the rear in plan view. 3. The driving mechanism according to claim 1, wherein a blowing impeller that generates a downward airflow is rotatably driven on an upper surface of the traveling transmission mechanism by power transmission from an input shaft or the intermediate shaft in the traveling transmission mechanism. 4. Riding lawn mower characterized by being provided in the. The vehicle according to any one of claims 1 to 3, wherein the engine is stopped when a worker separates from the cockpit, or one of the two rear wheels and a rotary mower from the engine. A riding lawn mower characterized in that a seat switch mechanism adapted to cut off power transmission to one or both is arranged.

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